Infinite, we focus on the dimensions we find simple to identify, what our attention heads focus on, but in Reality, there is infinite details we could define everything by, each vector in the high dimensional latent space of everything is a product of every other vector. The more life advances, the more vectors are added, a constant state of morphing/compressing takes place, we discover new shit out of our existing shit, then we compress 'em into one big pile of shit that becomes a dimension of each own. Regarding your second question, depends on what u mean by creatures, just like us ? probably not, impossibley unlikely to have creatures that went through the exact same evolutionary trip, However, I want to assure you the in the near future you will be interacting with an infinite number of creatures in ur life , since it's all in our heads, FUture AI creatures will find their markets, if they are just able to fit in the dance of the psyche